The variations of nitrogen and phosphorus transportation in the last decades were studied and their relationships with population,applied fertilizers and wastewater discharged in the basin were analyzed.

The Hydrographic data from three major CHINARE cruises and one Australian cruise along 73°E near Prydz Bay are interpreted to present the features and variations of water masses and geostrophic currents.

Spatial and temporal oscillation and long-term variation in sea surface temperature field of the South China Sea

Based on the daily data of solar radiation and sunshine duration from 1958 to 2000 at Beijing, China, the average annual solar radiation was calculated, and the long-term variation of solar radiation was analyzed in this paper.

In this paper, the study of long-term variational trend in the East China Sea is made by analysing the satellite sea surface temperature data, and it is shown from the analysis results that there is a 41 month or so variational cycle in the East China Sea in relation to ENSO.

Distribution of the total energy of geomagnetic field in the Earth s interior and it s secular variation in recent 300 years;

According to observation data at geomagnetic stations in Hebei Province from 1986 to 2005,we sum up and analyze the laws of the geomagnetic secular variation in this paper.

With geomagnetic field model records, several kinds of secular variation of geomagnetic dipole moment and the position of the geomagnetic north pole during the year 0～2000 A.